SciELO - Scientific Electronic Library Online

 
vol.66 número4Factores que Afectan el Margen de Ingreso Netro en Lecherías: Un análisis EstadísticoAstro-INIA: Primera Variedad de Poroto Granado Tipo Coscorrón de Hábito de Crecimiento Determinado Arbustivo índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados

Revista

Articulo

Indicadores

Links relacionados

Compartir


Agricultura Técnica

versión impresa ISSN 0365-2807

Resumen

VELASQUEZ F, Claudia  y  GERDING P, Marcos. Evaluation of Different Species of Trichogramma spp. to the Control of Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae). Agric. Téc. [online]. 2006, vol.66, n.4, pp.411-415. ISSN 0365-2807.  http://dx.doi.org/10.4067/S0365-28072006000400010.

Corn (Zea mays L.) crops are damaged every year by corn earworm Helicoverpa zea (Boddie) larvae (Lepidoptera: Noctuidae).  Two studies were carried out with the objective of defining the most adequate Trichogramma species to control the corn earworm. In the laboratory Trichogramma nerudai, T. maidis, T. evanescens, T. cacoeciae, T. pretiosum (strain 1) and T. pretiosum (strain 2) parasitism rates were compared on H. zea, Sitotroga cerealellaand Anagasta kuehniella eggs evaluating the percentage of parasitism at seven days after exposition. Native T. nerudai was effective or superior to the imported species, and it was, therefore, selected for field trials. The remaining tested Trichogramma species were less effective. In the field experiments the effect of four densities (200 000, 400 000, 800 000 and 1 600 000 parasitized eggs ha-1) of the native T. nerudai was evaluated in a commercial corn crop. The corn earworm damage was reduced to close to 20% with the highest Trichogramma density as compared with 90.5% produced in the control treatment. Trichogramma was an effective parasitoid alternative for control of this pest.

Palabras clave : corn earworm; biological control.

        · resumen en Español     · texto en Español

 

Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons